-27.42% is the change from 310 to 225
Calculation steps:
[( 225 - 310 ) ÷ 310] x 100 = -27.42%
Formula
Percentage change = [(225 - 310) / 310] x 100
Subtract the new number by the original number
225 - 310 = -85
-85 ÷ 310 = -0.27419354838709675
-0.27419354838709675 x 100 = -27.42%